Calculating-machine.



A. A. A. DREYFUS A A. H. v. LEVY.

GALGULATING MACHINE. APPLIUA'TION FILED oo'r., 190s.

vPatented May 4. 1909,/

'WiTNE SSE S 'UNITED sTATEspAaENT oFEioE.

ARMAND ALBER'l` ABRAHAM DREYFUS, OF HANDSWORTH, NEAR BIRMINGHAM, AND ALFRED HENRY VICTOR LEVY, OF EDGBASTON, NEAR BIRMINGHAM, ENGLAND.

cALcULATING-MACHINE.

Specification of Letters Patent.

Application led October 8, 1908. Serial'No. 456,828.

No. 920,840. l Patented May 4, 1909.

To all whom it may concern:

Be it known that we, ARMAND ALBERT ABRAHAM DREYFUS and ALFRED HENRY Vieron LEVY, subjects ofthe King ol'l Great Britain, residing at 2 Selbourne road, Handsworth, near Birmingham, England, and While Lodge, 7 Church road, Edgbaston, near Birmingham, England, respectively, have invented. certain new and useful Improvements in Calculating Machines, of which the following is a speciiication.

This invention relates to calculating machines and has for its object to provide a new and simplified construction of machine for mechanically adding or'subtracting any series of figures or numbers.

Figure l of the accompanying drawings represents a plan of a calculator constructed in accordance with this invention. Fig. 2 is a fragmentary section on line Fig. 1. Fig. 3 is a diametrical cross sectional view along the radial line ci' the hundreds indicator bar, the latter appearing in edge elevation. Fig. 4 is a plan of t-he hundreds bar detached from the machine. Fig. 5 shows the hundreds indicator in section and front elevation.

The same letters of reference indicate corresponding parts in each of the figures of the drawing. y

The base yplate a has its edge a* raised as shown, so as to forni said plate into a hollow (lished shape. Around said edge al a continuous series of numbers from l tolO() are marked, the last named number being indi; cated by Zero. 1Within the hollow interior of said base plate d, a central disk l) is arranged, saidv disk l) being pivotally mounted at c so as to be capable of being freely rotated. The edge ol' this disk is provided with a series of notches or teeth c1 equal in number to the figures around the edge of the base plate, .while near th'c edge of the disk, and opposite to said notches, is a series ol' numbers c2 from l 1 to 100, the latter being indicated by zero.

Formed in the l'acc ol' the disk c is a volute spiral groovey c3, commencing near the center and graduallj. increasing in diameter until it reaches nearly to the Yfigures c", giving, in the particular example. represented, eleven coils or revolutions ol' said spiral. Bridging this spiral is a flat radial bar d, one end oll which is fixed at the center, andthe other end upon the outer edgea1 of the base a. In this bar is formed an aperture cl1 which comes immediately over the figures c2 so as to expose one of the latter therethrough. There is also formed near the outer end the gap d2 whose inner end comes opposite to the zero mark on the edge a1 of the base a.

Carried by the bar d is an indicator e cons sist'mg of a small vertically-arranged sheet metal plate having a' slot e1 through which the bar d freely asses, so that the sides of said indicator em race the op osite edges of the bar. The lower edge of-this indicator is Jturned up and rounded, as at e, and engages with the spiral groove c3, so that when the disk c is'rotated, said spiral will cause the indicator e to move axially alon the bar. Thus for each complete revolution of the disk c, the indicator will be moved a distance equal to the itch of the s iral, and in order to indicate t e number o revolutions .thus made, and thus the number of hundreds calculated, the bar d is marked with a series of numbers d3, each opposite to one of the grooves of the spiral, so that the indicator comes op osite to one or other of said numbers accor ing to the number of revolutions of the disk c and thus the number of hundreds calculated. AThe indicator is also capable vof being lifted out of engagefor this purpose the latter being,r made flexible so that it can be arched as shown in dotted lines in Fig. 3.

The operation of the machine is as follows :-ln every case before eachoperation, the zero mark on the disk b must be brought beneath the aperture (Z1 of the bar d, and the indicator at the outer end of the bar. For the purpose of adding a series of numbers, for instance, 1l, 8 and 23, after the machine able style or the like is placed in the notch opposite the ligure l1 on the outside ring ol" ligures, and the disk b rotated thereby until the style engages the bar d as a stop, entering the reccssd2 thereof. The number l1 on the disk will then appear beneath the aperture d1. Then place the style in the notch opposite the figure 8 of the outside ring and move the disk as before, and then repeat the operation `With respect to the figure .28, the stylebeing placed m the notch opposite this ment with the spiral and slid along the bar,

has been placed in its zero position, a suitnumber on the said outside. ring. When it has been brou ht around to the recess d2 the number 42 wil appear beneath the` aperture d1, that vis, the total sum required. When the total exceeds 100 the indicator e 'will automatically register each hundred.

In order to subtract two numbers, the figures upon the disk b represent the minuend, and the numbers upon the outer ring a1 the subtrahend. Thus to subtract 47 from 84,

the style is placed in the notch opposite to the figure 84 and moved around until opposite to the number .47 jupon the outer ring al, when 37, the difference betweenthe two numbers, will appear beneath the aperture di. Should the two numbers be for instance 129 and 57, the style-is laced in the notch opposite the figure 29 an turned past the bar d until same comes o osite to number 57 on the outer ring. en the dierence exceeds 100, the indicator e Will automatically register each successive hundred.

Having fully described our invention, what We desire to claim and secure by Letters Patent is v 1. In a calculating machine, the combination of a rotatable disk having a volute spiral groove therein, a radial' and graduated indi'- cator bar arranged over said plate, and an indicator carried by said bar consistingl of an open frame through an opening in which the bar passes, the lower end of said indicator engaging with the spiral groove of the rotatable disk and adapted by the rotation of the latter, to be moved along the bar, the Whole operating as described and set forth.

2. In a calculating machine the combina tion of a dished base plate having a raised periphery marked with a series of figures, a rotatable disk mounted upon said base plate, having its edge provided with a series of' numbered notches, and having a volute spiral groove in the face thereof', a radial hundreds indicator bar arranged over said plate and being graduated tocorrespond to the coils of said groove and an indicator carried by said bar consisting of an open frame through an opening in -which the bar passes, the lower end of said indicator being formed so as to engage with the spiral groove of the rotatable disk and adapted, by the rotation of' the' latter to be moved along the bar, and also adapted to be lifted out of engagement with said spiral and moved to any position upon said bar, the whole being constructed and operating substantially as described and set forth.

3. In a calculating machine, in combination,- a base late having a raised peripheral,

portion in ar red with a series of gures, a rotatable disk mounted upon the base plate and having its peri heral edge [portion marked with a series o figures corresponding to the figures on the base plate, a radially disposed resilient indicator bar having its end portions fixed, a member mounted on the and having its perifpheral edge portion -marked with a series o figures corresponding to the figures on thebase plate, a radially disposed indicator bar, a member mounted on theiiidicator Ibar for movement axially thereof, and means upon the disk for engagement with the member to cause radial movement thereof when the disk is operatively rotated, said member having an openingl through which the indicator bar passes and being movable away from the disk out of engagement with said means.

5. In a calculating machine, in combination, a base plate having a raised peripheral portion marked with a series of figures, a ro tatable disk mounted upon the base plate and having its eripheral portion marked with a series of gures corresponding to the figures on the plate,`said disk having also a volute spiral groove, a radially disposed indicator bar, and a member slidable axially of' the indicator bar and having its lower end of upturned angular cross section for conformableengagement in said groove.

6. In a calculating machine, in coinbina- 3 tion, a base plate having a raised peripheral dicator bar having its ends fixed, a member,

movable axially of said indicator and means on the disk engaging said member to cause ico radial movement thereof upon operative rotation of said disk, said indicator bar having an opening in its outer end portion to expose the particular figure of the disk thereunder.

7. In a calculating machine, in combination, a base plate having a peripheral portion marked with a series of' figures, a disk rota tably mounted upon said base plate and having its peripheral portion marked with a series of figures corresponding to the figures on the base plate and having also peripheral notches, corresponding in number and arrangement to the figures and a fixed radially disposed bar having a portion thereof bevond the edge of the disk formed with a notch, as and for the purpose set forth.

8. In a calculating machine, in combination, a base plate having a raised peripheral portion marked with a series of gures, a disk rotatably mounted upon the base plate and having its peripheral portion marked with a series of figures corresponding to the figures on thebase plate, the disk having also a, voset our hands in presence of tWo subscribing lute spiral groove, a Hat resilient radially dis- Witnesses.,

posed indicator bar, and a member mounted upon the bar for movement axially thereof 5 and having an end portion engaged in said groove.

In testimony whereof we have hereunto ARMAND ALBERT ABRAHAM DREYFUS. ALFRED HENRY VICTOR LEVY. itnesses:

HENRY SKERRETL' HENRY NORTON SKERRETT. 

